Article
Agricultural Engineering
Yaoqi Hou, Mengqi He, Yongjie Liu, Qian Wang, Aopan Yang, Fei Yang, Zhongfang Lei, Xuesong Yi, Weiwei Huang
Summary: This study investigated the nitrogen removal mechanisms during swine manure anaerobic digestion and the effects of biogas circulation and activated carbon addition. The methane yield was increased by 25.9%, 22.3%, and 44.1% with biogas circulation, activated carbon addition, and their combination, respectively. Nitrification-denitrification was found to be the dominant ammonia removal pathway in all digesters, while anammox did not occur. Biogas circulation promoted mass transfer and enriched nitrification and denitrification bacteria and functional genes, while activated carbon facilitated ammonia removal as an electron shuttle. The combined strategies significantly reduced total ammonia nitrogen by 23.6%.
BIORESOURCE TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Junhui Li, Paul Dijkstra, Qihong Lu, Shanquan Wang, Shaohua Chen, Deqiang Li, Zhiheng Wang, Zhenglei Jia, Lu Wang, Hojae Shim
Summary: The study identified 952 genomes carrying genes associated with DMF degradation, expanding the known diversity of bacteria with this metabolic capability. Both aerobic and anaerobic pathways for DMF degradation were found, with microbial consortia potentially more advantageous than pure culture in degrading DMF in wastewater.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Environmental Sciences
Wen Wang, Mehdi Nemati
Summary: The anoxic co-biodegradation of linear and cyclic naphthenic acids (NAs) coupled with denitrification in denitrifying biofilm reactors showed that octanoic acid had the fastest biodegradation rate. The presence of recalcitrant NAs did not influence the biodegradation of octanoic acid and trans-4MCHCA, while co-biodegradation of cis- and trans-4MCHAA with other compounds enhanced the biodegradability of these recalcitrant NAs. This anoxic biodegradation method could be an effective alternative for treating oil sands process water, offering faster rates compared to aerobic methods.
ENVIRONMENTAL TECHNOLOGY
(2021)
Review
Engineering, Environmental
Sanket Dey Chowdhury, Puspendu Bhunia, Rao Y. Surampalli
Summary: The vermifiltration technology has gained attention as an alternative for treating wastewater. This review comprehensively explores the innovative strategies and techniques to improve the removal of organic and nutrient pollutants from wastewater using modified vermifilters.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Environmental Sciences
Sheng Tang, Qingxu Ma, Jipeng Luo, Yinan Xie, Muhammad Laeeq ur Rehman Hashmi, Wankun Pan, Nan Zheng, Mengjiao Liu, Lianghuan Wu
Summary: Tea polyphenols, especially EGCG, have a significant inhibitory effect on soil nitrification by reducing the abundance of ammonia oxidizing microorganisms. The inhibition effect of tea polyphenols on nitrification is more pronounced compared to denitrification. Additionally, tea polyphenols enhance the diversity of bacterial community in soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Jianqi Yuan, Shaobin Huang, Haiguang Yuan, Feichao Fu, Yongqing Zhang
Summary: The study found that chloramphenicol had different effects on nitrification and denitrification in SBBR, and the bacterial community showed significant variations at different CAP concentrations. Overall, the research provides a theoretical guide for the treatment of practical wastewater in SBBR.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Jhonattas Carvalho Carregosa, Julian Eduardo Ballen Castiblanco, Tarcisio Martins Santos, Paloma Santana Prata, Jandyson Machado Santos, Alberto Wisniewski Jr
Summary: This study investigates the changes in the chemical compositions of oils after spill events, focusing on the early stages of weathering. It finds that the marine environment has less oxidative effects compared to the riverine environment on the chemical compositions of crude oils. The results also show the evaporation process during the first 72 hours after oil release, with the disappearance of certain compounds and changes in weathering indexes and organic compound ratios.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Microbiology
Parisa Chegounian, Stephane Flibotte, Kerry Peru, John Headley, Dena McMartin, Bryne Gramlich, Vikramaditya G. Yadav
Summary: By isolating two microorganisms from oil sands tailings and analyzing their transcriptomes, this study identified the genes upregulated during the degradation of Naphthenic acid fraction compounds (NAFCs). The research also revealed the metabolic network and mechanisms used by the microbial cultures for NAFC degradation, providing new directions for engineering or evolving microorganisms for more stable and aggressive degradation.
Article
Engineering, Environmental
Xiaoyu Zhang, Dan Chen, Xinying Hou, Na Jiang, Yan Li, Shijian Ge, Yang Mu, Jinyou Shen
Summary: This study developed an algal-bacterial aggregates (ABA) system for simultaneous pyridine and nitrogen removal. Nitrification-denitrification co-metabolism was found to enhance the removal process. Fluorescence in situ hybridization and microelectrode analysis confirmed the microenvironment differences between bacteria and algae in the system.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Yuanyuan Miao, Liang Zhang, Deshuang Yu, Jianhua Zhang, Wenke Zhang, Guocheng Ma, Xinchao Zhao, Yongzhen Peng
Summary: Intermittent aeration is an effective strategy for biological wastewater treatment, allowing for advanced nitrogen removal and reduced energy consumption. It is suitable for partial nitrification and denitrification processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Zixia Qiao, Sihai Hu, Yaoguo Wu, Ran Sun, Xiaoyan Liu, Jiangwei Chan
Summary: The study found that microorganisms in mixed cultures have significant capability in transforming ammonium and phenanthrene, leading to notable changes in organic carbon characteristics. Evaluation of the organic carbon changes through parameters like fluorescence intensity and degradability showed that aromatic structures and some condensed molecules were easier to break down in the mixed cultures of ammonium and phenanthrene.
Article
Soil Science
Nadine Loick, Elizabeth Dixon, G. Peter Matthews, Christoph Mueller, Veronica S. Ciganda, Maria Lopez-Aizpun, Miguel A. Repullo, Laura M. Cardenas
Summary: This study quantifies the production and consumption pathways of N2O in soil using labelled substrate-N, showing the impact of different water filled pore space on N-transformation processes and emissions. The research highlights the importance of heterotrophic nitrification and denitrification in the N2O emissions, demonstrating the complex relationship between water filled pore space and nitrogen transformations.
Article
Agricultural Engineering
Huan Yang, Yueyue Wang, Zichao Wang, Shengyu Yuan, Changwei Niu, Yaohui Liu, Yun Gao, Yuhan Li, Dan Su, Youtao Song
Summary: This study aimed to investigate the effects of polytetrafluoroethylene nanoplastics on the joint inhibitions of ciprofloxacin and bivalent copper on nitrogen removal in a sequencing batch reactor and its potential mechanisms. The results showed that polytetrafluoroethylene nanoplastics enhanced the toxicities of ciprofloxacin and bivalent copper on sludge activities and microbial community involved in nitrogen removal. Additionally, the adsorption of ciprofloxacin and bivalent copper was promoted by polytetrafluoroethylene nanoplastics. This study provides important insights into the impact of combined heavy metals and antibiotics on the performance of a sequencing batch reactor under nanoplastics stress.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Giuditta Bonetti, Katy E. Limpert, Kasper Elgetti Brodersen, Stacey M. Trevathan-Tackett, Paul E. Carnell, Peter Macreadie
Summary: Freshwater wetlands are important carbon sinks, but their conversion for agriculture and human activities can turn them into significant sources of greenhouse gas emissions. This study investigates the combined effects of hydrological alteration and nitrogen input on carbon and nitrogen cycling in wetland soils. The results show that both physical and chemical disturbances increase greenhouse gas emissions, leading to a significant increase in Global Warming Potential. The findings highlight the importance of considering the interactive effects of different disturbances when planning wetland rehabilitation.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Jiao Sun, Zuotao Zhang, Hui Wang, Matthew J. Rogers, Haijiao Guo, Jianzhong He
Summary: The study demonstrated the effective anaerobic degradation of PAHs using the anaerobic co-culture DYM1 obtained from petroleum-polluted soil without the need for additional terminal electron acceptors. This provides a novel approach for recovering energy from toxic pollutants in the form of methane.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Jinchen Chen, Xiaoguang Liu, Spyros G. Pavlostathis
Summary: Peracetic acid (PAA) is widely used as a disinfectant in various industries, including poultry processing, but its potential inhibitory effect on biological wastewater treatment processes in this industry is not well understood. This study found that high levels of H2O2 and PAA directly added to bioreactors significantly impacted aerobic degradation and nitrification processes, primarily due to enzyme inhibition rather than cell viability loss. Fast recovery of these processes was observed once the direct addition of H2O2 and PAA solution ceased.
Article
Energy & Fuels
Xiaoguang Liu, Qian Wang, Yuanzhi Tang, Spyros G. Pavlostathis
Summary: The study evaluated the impact of inter-stage hydrothermal treatment on sewage sludge mixture digestion and found that it increased the ultimate biodegradability of the sludge, but did not significantly affect the overall methane production compared to pre-treatment. Different digestion configurations showed varying performance in methane production, solids reduction, nutrient transformation, and energy balance. Further research is needed to optimize the inter-stage hydrothermal treatment process for efficient energy recovery in sewage sludge digestion.
Article
Green & Sustainable Science & Technology
Liming Yang, Yanni Geng, Dan Cui, Zhuochao Liu, Zhensheng Xiong, Spyros G. Pavlostathis, Penghui Shao, Xubiao Luo
Summary: This study used a corrected response surface methodology to optimize the operation strategy for treating rare earth elements wastewater using microalgae. By investigating the effects of temperature, illumination intensity, and microalgae concentration, nine models were obtained and then modified based on initial ammonia nitrogen concentrations. The results demonstrate that optimizing microalgae dosage can effectively treat wastewater.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Yanni Geng, Dan Cui, Liming Yang, Zhensheng Xiong, Spyros G. Pavlostathis, Penghui Shao, Yakun Zhang, Xubiao Luo, Shenglian Luo
Summary: A study found that the nitrogen removal efficiency in rare earth mine effluent is low, with limited microalgae biomass. However, when carbonate is added, Chlorococcum sp. shows higher nitrogen removal rate and biomass yield, along with high lipid content. The extracellular polymeric substance released by microalgae contributes to easier resource harvest.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
John L. Wilkinson, Alistair B. A. Boxall, Dana W. Kolpin, Kenneth M. Y. Leung, Racliffe W. S. Lai, Cristobal Galban-Malagon, Aiko D. Adell, Julie Mondon, Marc Metian, Robert A. Marchant, Alejandra Bouzas-Monroy, Aida Cuni-Sanchez, Anja Coors, Pedro Carriquiriborde, Macarena Rojo, Chris Gordon, Magdalena Cara, Monique Moermond, Thais Luarte, Vahagn Petrosyan, Yekaterina Perikhanyan, Clare S. Mahon, Christopher J. McGurk, Thilo Hofmann, Tapos Kormoker, Volga Iniguez, Jessica Guzman-Otazo, Jean L. Tavares, Francisco Gildasio De Figueiredo, Maria T. P. Razzolini, Victorien Dougnon, Gildas Gbaguidi, Oumar Traore, Jules M. Blais, Linda E. Kimpe, Michelle Wong, Donald Wong, Romaric Ntchantcho, Jaime Pizarro, Guang-Guo Ying, Chang-Er Chen, Martha Paez, Jina Martinez-Lara, Jean-Paul Otamonga, John Pote, Suspense A. Ifo, Penelope Wilson, Nikolina Udikovic-Kolic, Milena Milakovic, Despo Fatta-Kassinos, Lida Ioannou-Ttofa, Jan Vymazal, Bayable A. Kassa, Jeanne Garric, Arnaud Chaumot, Peter Gibba, Ilia Kunchulia, Sven Seidensticker, Gerasimos Lyberatos, Halldor P. Halldorsson, Molly Melling, Thatikonda Shashidhar, Manisha Lamba, Anindrya Nastiti, Adee Supriatin, Nima Pourang, Ali Abedini, Omar Abdullah, Salem S. Gharbia, Francesco Pilla, Benny Chefetz, Tom Topaz, Koffi Marcellin Yao, Bakhyt Aubakirova, Raikhan Beisenova, Lydia Olaka, Jemimah K. Mulu, Peter Chatanga, Victor Ntuli, Nathaniel T. Blama, Sheck Sherif, Ahmad Zaharin Aris, Ley Juen Looi, Mahamoudane Niang, Seydou T. Traore, Rik Oldenkamp, Olatayo Ogunbanwo, Muhammad Ashfaq, Muhammad Iqbal, Ziad Abdeen, Aaron O'Dea, Jorge Manuel Morales-Saldana, Heidi de la Cruz, Ian Navarrete, Fabio Carvalho, Alhaji Brima Gogra, Bashiru M. Koroma, Vesna Cerkvenik-Flajs, Mitja Gombac, Melusi Thwala, Kyungho Choi, Habyeong Kang, John L. Celestino Ladu, Andreu Rico, Priyanie Amerasinghe, Anna Sobek, Gisela Horlitz, Armin K. Zenker, Alex C. King, Jheng-Jie Jiang, Rebecca Kariuki, Madaka Tumbo, Ulas Tezel, Turgut T. Onay, Julius B. Lejju, Yuliya Vystavna, Yuriy Vergeles, Horacio Heinzen, Andres Perez-Parada, Douglas B. Sims, Maritza Figy, David Good, Charles Teta
Summary: Environmental exposure to active pharmaceutical ingredients (APIs) can have negative effects on ecosystems and human health. A global-scale study of API pollution in rivers highlights the highest concentrations in sub-Saharan Africa, south Asia, and South America, primarily in low- to middle-income countries with poor wastewater and waste management infrastructure. The most frequently detected APIs include carbamazepine, metformin, and caffeine, with some concentrations exceeding safe levels for aquatic organisms. Pharmaceutical pollution poses a global threat to environmental and human health and has implications for achieving the United Nations Sustainable Development Goals.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Environmental
Xiaoguang Liu, Jinchen Chen, Ding-Hsiang Lin, Spyros G. Pavlostathis
Summary: This study assessed the long-term effect of peracetic acid (PAA) solution on the anaerobic treatment of poultry processing wastewater. Results showed that direct addition of PAA solution completely inhibited biogas production and required a relatively long incubation time for recovery.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jinchen Chen, Spyros G. Pavlostathis
Summary: This study evaluated the impact of PAA solution on the performance of a biological nitrogen removal system. The results showed that the system was negatively affected by residual PAA, but recovery was achieved quickly after ceasing PAA addition.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Madan Tandukar, Spyros G. Pavlostathis
Summary: The study investigated the benefits of co-digestion of a sludge-mix with concentrated fat-oil-grease (FOG), finding that it can enhance the degradation of sludge and increase methane production. Co-digestion is feasible and recommended for municipal wastewater treatment facilities to match target biogas/methane levels by balancing energy production and solids destruction based on their specific needs.
Review
Engineering, Environmental
Genping Yi, Bo Wang, Yufa Feng, Difan Fang, Liming Yang, Wenzong Liu, Yifeng Zhang, Penghui Shao, Spyros G. Pavlostathis, Shenglian Luo, Xubiao Luo, Aijie Wang
Summary: Wastewater carries significant energy that is often ignored, but can be converted to bioelectricity and chemicals by microbes in microbial electrochemical systems. Photo-assisted MESs have emerged as a sustainable platform for enhancing wastewater treatment and bioenergy recovery using solar light. However, the development of photo-assisted MESs is still in its early stages.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Engineering, Environmental
Cheng Cheng, Qiang He, Jian Zhang, Hongxiang Chai, Yujing Yang, Spyros G. Pavlostathis, Haiming Wu
Summary: This study investigated the mechanisms and effects of manganese oxide-mediated ammonium oxidation in wetlands. The results showed that wetlands with manganese sand had a higher removal efficiency of ammonium nitrogen and reduced nitrous oxide emission. The manganese sand delayed the oxidation of ammonium nitrogen, and the presence of specific bacterial communities promoted the removal of ammonium nitrogen.
Editorial Material
Environmental Sciences
Cheng Cheng, Qiang He, Jian Zhang, Bowen Chen, Spyros G. Pavlostathis
Summary: This article summarizes the role of aerobic methanotrophic bacteria in anaerobic methane oxidation (AOM) under nitrite or mineral oxide dependence, as well as their new metabolic trait of simultaneously reducing nitrous oxide and oxidizing methane under hypoxic conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Jinchen Chen, Tianze Song, Sha Long, Kevin J. Zhu, Spyros G. Pavlostathis
Summary: This study assessed the effects of peracetic acid (PAA) and hydrogen peroxide (H2O2) solutions on nitrification kinetics, cellular responses, and gene expression in a nitrifying culture. The results showed that PAA mainly inhibited nitrification through enzyme inhibition, while H2O2 had minimal impact. The study provides important insights for the design and operation of biological nitrogen removal systems for PAA-bearing wastewater.
Article
Environmental Sciences
Sha Long, Xiaoguang Liu, Jinchen Chen, Lin Zhao, Spyros G. Pavlostathis
Summary: This study investigated the effects of tetracycline (TC) on bio-electrochemically assisted anaerobic methanogenic systems (An-BES) for wastewater treatment. The results showed that TC had minimal effect on methane production at low concentrations, but significantly reduced methane production and current output at high concentrations. TC was predominantly removed through adsorption, and the application of voltage enhanced its removal. The electrode biofilms had higher abundance of propionate oxidizing bacteria and methanogens, while antibiotic resistance genes were less abundant compared to suspended cultures. TC inhibited certain functional microorganisms and pathways, leading to decreased performance of An-BES systems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yuanqi Liu, Zhuochao Liu, Dan Cui, Liming Yang, Haiyu Wang, Spyros G. Pavlostathis, Yanni Geng, Zhensheng Xiong, Penghui Shao, Xubiao Luo, Shenglian Luo
Summary: By adding a biodegradable carrier, loofah, the microalgae-bacteria symbiotic system achieved a 100% removal rate of high concentration ammonia nitrogen (NH4+-N) and showed good stability. The loofah also released a considerable amount of carbon that could support denitrification. The study expands our understanding of the enhanced role of carbon-based carriers in the denitrification of rare earth element tailings wastewater.
Proceedings Paper
Computer Science, Artificial Intelligence
Lavdie Rada, Yusuf Baran Tanriverdi, Omer Ekmel Kara, Elizabeth M. Hemond, Ulas Tezel
Summary: This paper introduces a method for citizen-based water-quality monitoring through simple pattern classification of water crystallization using a smartphone and portable microscope. The method allows for remote analysis of water resource contamination, laying the foundation for the development of a Water Expert System smartphone application.
INTELLIGENT COMPUTING SYSTEMS (ISICS 2022)
(2022)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.